Improvement in bench-planes



ysupports in part the handle In.

UNITED STATES PATENT WILLIAM MONTGOMERY, OF AMITY, PENNSYLVANIA.

IMPROVEMENTy IN BENCH-PLANES.

Specification forming part of Letters Patent No. 180,050, dated July 18, 1876; application filed April 27, 1676.

To all whom it may concern:

Be it known that IVWILLIAM MONTGOM- ERY, of Amity, in the county 0f Washington and State of Pennsylvania, have invented Improvements in Bench-Planes; and I do hereby declare that the following is a full, clear, and exact description ofthe same, reference being had to the accompanying drawing, which forms part of this specication.

My invention relates to a new combination of devices for adjusting and clamping the blade or plane iron in the stock of the plane; and it consists in the combination of devices employed as hereinafter more fully set forth.

Figure 1 in the accompanying drawing, represents a vertical longitudinal section through my improved plane. Fig. 2 is a section through the plane irons and attachments thereof on the line sa x. Fig.v 3 is a top view of the bed-plate, to which the clamping-lever, which secures the irons in the plane-stock, is pivoted. Fig. 4 is a diagram illustrating the manner in which the grain of the wood runs in relation to the face ofthe plane.l

A is the stock, which may be mad'e of wood or metal. The said stock is thinner, measured vertically, at the rear end or heel than at the forward end, and at the rear end the stock is provided with a projection, p, which In 'cutting the plane-stock to the wedge form the grain of the wood is ent obliquely across, as shown in Fig. et, in which the dotted lilies represent the grain of the wood, and the line ff represents the face ofthe plane. The bed-plate B, shown in Fig. 3, and in section in Fig. l, is attached to the top of the plane-stock A, at the back of the throat T of sai'l stock, the attachment heing made by screws w. The bed-plate B has at its front end lugs l, Fig. 5, to which is pivotcd, by a screw-bolt, or in any other suitable manner, the bent lever L, the said bedplate being cut away between the said lugs to make room for said lever. L, and the tops of said lugs being rounded oli", t0 allow the planeirons i t to retreat far enough at the top to allow the insertion of a wedge under them at the bottom. The front part of the lever L passes down into the throat T of the plane, a recess, r, being formed -in the back of said throat for the reception of the said front part of said lever, and the rear part of Asaid lever passes backward over the top ofthe bed-plate, at the rear of the said throat T. In the rear part of said lever is fitted a thumb-screw, R,

and in the front part of said lever is formed a dovetail-groove, g, shown in section in Fig. 2.

The head of the screw m, which holds the top iron on the cutting-iron of the plane, is made in the form of a frustuin of a cone, and of dimensions to adapt it to the dovetail groove g in the front part of the lever L'. The point of the thumb-screw R restsin a notched saddle, S, either on the handle h, the bed-plate B, or'the plane-stock A. in various kinds of plaines, and the said screw' may lit a female screw in the rear end ofthe lever L, or it may fit the thread of a nut swiveled to the said lever. The half-handle h is formed in one piece with the bed-plate B, as shown in Fig. l, when the plane-stock A is made of wood; but when the plane-stock is made of metal thebed-plate B may be dispensed with, and the lugs l of the same, and thef handle h, may-be cast in one piece with said stock. handle is used,it is attached to the stock, and not to the bed-plate B. Also, in long-faced planes the projection p, which supports the rear of the handle in short-faced planes, is

omitted, there heilig' space enough for the support of said handle without the projection. The cuttingiron i and top iron t are fitted into the throat, as shown in Fig. l, the top iron being held upon the cutting-ironby the screw m., which passes through the slot n in the cutting-iron, and screws into the top iron inthe usual manner.

The adjustment and clamping of theirons i and t are performed as follows: The top iron t is placed in its proper position on the cuttingiron t', and is fastened there by the screw m. The irons are lthen placed in the throat vT of the stock A, the head of the. screw m passing. down intol the groove g of the lever L. The screw It is then turned down, and, its'point being prevented from advancing, the hinder part ot' the lever L is forced upward. This forces the lower part of the lever L downward and rearward, and draws backward and downward the screw m, the head of which is engaged in the groove'g of the said lever, and the opposite end of which is engaged in the EFICE.

female screw of' the top iron t. The planeirons are thus firmly pressed against the lower part ofthe throat of the plane-stock, and that purtofthe lever L in front of the pivot of seid lever, which pressure securely clamps the irons in the plane-stock.`

The head of the screw m might be made of proper form to engage a groove of' rectangular cross-section in the lower part ofthe lever L; but I prefer the dovetail groove und the oorrespondinp; shape of' head for the said screw, because this form gives :t wedging action, which holds the irons powerfully Without excessive strain on the thumb-screw R.

A cheap, easyrunning, and durable plane `is thus produced, in which the handle is B. F. MoN'LGroiiltumf,V JAMEs B. MONTGOMERY. 

